JP4137617B2 - Composite writing instrument - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
According to the present invention, a plurality of writing bodies each including at least one mechanical pencil writing body are accommodated in a shaft cylinder, and a tip of a desired writing body is selectively projected from a tip of a front shaft to be switched to a writing position. In particular, the present invention relates to a composite writing instrument that is improved with respect to replenishment of the lead to the mechanical pencil writing instrument.
[0002]
[Prior art]
In the composite writing instrument, when replenishing the lead to the mechanical pencil writing body, the core can be inserted from the rear end of the shaft tube in the same manner as a normal writing instrument that is not a composite writing instrument. In the past, there has been proposed a core replenishment operation (see, for example, Patent Document 1 and Patent Document 2).
[0003]
For example, in the composite writing instrument disclosed in Patent Document 1, a core insertion hole communicating with the core case pipe is provided at the rear end of the sliding piece fixed to the rear end of the core case pipe of the mechanical pencil writing body. A slope similar to the cam slope is provided on the inside of the cylindrical cam that has a cam slope that contacts the cam slope provided on the rear end side of the slide piece. The cylindrical cam is provided with a core insertion hole that matches the core insertion hole when the sliding piece is on the most retracted side, and the core insertion hole of the cylindrical cam is opened. A centering device that can be set in the closed state is attached to the cylindrical cam. When refilling the lead, place the mechanical pencil in the last retracted side, pull the lead-fastening device backward, and open the lead-through hole of the cylindrical cam, then insert the lead from the lead-through hole in the open state. To do.
[0004]
Further, in the composite writing instrument disclosed in Patent Document 2, the tip of the cylindrical tube is inserted into the rear end of the core case pipe of the mechanical pencil writing body, and the rear end of the cylindrical tube extends to the vicinity of the rear end of the housing. I'm out. When refilling the core, the cap at the rear of the housing is removed, and the core is inserted from the rear end of the cylindrical tube.
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-314491 (first column, lines 12 to 20)
[Patent Document 2]
US Pat. No. 6,315,477 Specification
[Problems to be solved by the invention]
However, in the case of the above-mentioned patent document 1, the lead is replenished unless the mechanical pencil writing body is set to the last retreat side so that the core insertion hole of the sliding piece and the core insertion hole of the cylindrical cam are matched. There is a problem that it cannot be done. On the other hand, the one described in Patent Document 2 can replenish the lead regardless of the state of the mechanical pencil cursive.
[0007]
By the way, in order to smoothly move a plurality of writing bodies back and forth within the shaft cylinder, a guide shaft that rotates integrally with the front shaft and guides a sliding piece (also referred to as a slider) in the front-rear direction is used as a rear shaft. It is desirable to provide in. On the other hand, when the guide shaft is provided, a configuration and a space for mounting the guide shaft in the rear end portion of the rear shaft are necessary, and it is difficult to secure a core insertion path to the mechanical pencil writing instrument. There is. In the configurations described in Patent Documents 1 and 2, since the guide shaft is not provided, the space at the rear end of the rear shaft can be used relatively freely as a core insertion passage. There is no disclosure of a configuration in which the shaft can be securely attached to the rear shaft and the pencil can be refilled in any position where the mechanical pencil cursive is in the most retracted, most advanced or intermediate position. Absent.
[0008]
The present invention has been made in view of such a problem, and its purpose is to secure a core insertion path even if a guide shaft is provided, and the mechanical pencil writing body can be any one from the most retracted position to the most advanced position. To provide a composite writing instrument capable of replenishing a mechanical pencil cursive from the rear even when in position.
[0009]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the invention according to claim 1 of the present invention houses a plurality of cursive bodies, at least one of which is a mechanical pencil cursive body, and can be rotated relative to the front shaft and the front shaft. And a rear shaft provided with a cam portion inside, and by rotating the rear shaft relative to the front shaft, the tip of one of the plurality of writing bodies is selectively advanced by the cam portion. In a composite writing instrument that can protrude from the tip of the shaft,
A guide shaft that is coupled to the front shaft so as to be integrally rotatable and guides the writing body in the front-rear direction extends in the rear shaft, and an inner surface of the rear shaft protrudes in an inner diameter direction. A stop step portion is formed, and a plurality of locking pieces are formed at the rear end portion of the guide shaft and pass through the inner diameter side hollow portion of the locking step portion and locked to the locking step portion. A core derivative that is rotatable relative to the rear shaft is disposed between the plurality of locking pieces, and the core derivative extends further forward to the rear end opening of the core case of the mechanical pencil cursive body. and has a core inductive portion communicating, the plurality of engaging pieces on the peripheral surface are formed a plurality of recesses for fitting, the inner diameter side hollow locking stepped portion of the annular formed before Symbol rear axle It passes through the section.
[0010]
The guide shaft is securely attached so as to be rotatable with respect to the rear shaft by the locking piece being locked to the locking step portion of the rear shaft. The core derivative efficiently uses the narrow space in which the rear shaft locking step portion is formed in order to pass through the inner shaft side hollow portion of the rear shaft locking step portion together with the guide shaft locking piece. And a core insertion path by the core derivative can be secured. Since the core derivative can rotate with the guide shaft, no matter how the mechanical pencil cursive is in the position from the most retracted position to the most advanced position, in other words, how the mechanical pencil cursive is relative to the rear axis. Even if the rotation position is in the correct position, the lead guiding portion of the lead derivative is always in communication with the rear end opening of the lead case on the almost same line as the lead case of the mechanical pencil writing body, so that the lead can be replenished. Further, since the guide shaft guides the cursive body, the cursive body can smoothly move in the front-rear direction.
[0011]
According to a second aspect of the present invention, the slider according to the first aspect is provided with a slider that cooperates with the cam portion at the rear end of the cursive body, and the slider is guided in the front-rear direction by the guide shaft. It is characterized by being. Since the slider is guided by the guide shaft, the writing body can smoothly move in the front-rear direction.
[0012]
The invention according to claim 3 is the one according to claim 1 or 2, wherein the core derivative has a main body portion disposed between the plurality of locking pieces and formed with the recess, A core insertion hole is formed so as to penetrate between the main body portion and the core guiding portion. The core can be replenished through the core insertion hole.
[0013]
According to a fourth aspect of the invention, in the third aspect of the invention, the core insertion hole is formed between two adjacent concave portions of the main body portion. With this configuration, a narrow space in which the rear shaft locking step portion is formed can be efficiently performed without competing / interfering with the core insertion passage by the core insertion hole and the locking piece of the guide shaft fitted in the recess. Can be used.
[0014]
The invention according to claim 5 is the one according to any one of claims 1 to 4, wherein the locking piece of the guide shaft is prevented from being displaced in the inner diameter direction by the core derivative. And Since the locking piece cannot be displaced in the inner diameter direction by the core derivative, the locking piece is prevented from being released from the locking step. As a result, the guide shaft is securely attached to the outer shaft.
[0015]
The invention according to claim 6 is the one according to any one of claims 1 to 5, wherein the core derivative forms an outer contour having a circular cross section along with a locking piece of the guide shaft. To do. With this configuration, the locking piece of the core derivative and the guide shaft can smoothly rotate within the inner diameter side hollow portion of the annular locking step portion.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0017]
FIG. 1 is an overall longitudinal sectional view showing a composite writing instrument according to an embodiment of the present invention. In the figure, a plurality of writing bodies 12, 14, 15 (not shown because one is on the front side) are accommodated in the shaft tube 10, and one of them is a mechanical pencil writing body 12, The remaining two are ballpoint pens 14 and 15. Two or all of them may be mechanical pencil cursives. Moreover, the number of the cursives accommodated in the shaft cylinder 10 is not limited to three, and may be two or more.
[0018]
The shaft tube 10 includes a front shaft 20 and a rear shaft 22 that can rotate relative to the front shaft 20. The front shaft 20 and the rear shaft 22 are detachably connected via a guide shaft 24. That is, a female screw portion 20a is formed on the inner peripheral surface of the rear end portion of the front shaft 20, and the female screw portion 20a is detachable from a male screw portion 24a formed on the outer peripheral surface of the tip end portion of the guide shaft 24. Screwed. The guide shaft 24 extends inside the rear shaft 22, and a plurality of locking pieces 24 b formed at the rear end of the guide shaft 24 are engaged with an annular locking step portion 22 a formed on the inner peripheral surface of the rear shaft 22. It is stopped and attached to the rear shaft 22 so that it can rotate relative to the rear shaft 22 and cannot be removed.
[0019]
As shown in FIG. 2, the guide shaft 24 has a plurality of concave slide grooves 24 c formed at equiangular intervals on the outer peripheral surface thereof in accordance with the number of writing bodies. The sliders 16, 18, and 19 attached to the rear ends of the writing bodies 12, 14, and 15 can slide through the slide grooves 24c. Further, a partition portion 24d is formed immediately behind the male screw portion 24a of the guide shaft 24, and a spring 26 is interposed between the partition portion 24d and the sliders 16, 18, and 19, The sliders 16, 18, and 19 are always pushed backward. At the rear end portion of the guide shaft 24, the locking piece 24b extending further rearward from the outer peripheral surface portion where the slide groove 24c is not formed is formed. Furthermore, a hook-like protrusion 24e protruding in the outer diameter direction is formed at the tip of each locking piece 24b. In this case, the number of the locking pieces 24b is the same as the number of the cursive letters, but is not limited to this and may be different. Rather, from the standpoint that the hook-like protrusion 24e of the locking piece 24b is stably locked to the annular locking step portion 22a, preferably, there are three locking pieces 24b irrespective of the number of the cursive letters. Good degree. The locking piece 24b passes through the hollow portion on the inner diameter side of the annular locking step portion 22a formed on the inner peripheral surface of the rear shaft 22, and the hook-shaped protrusion 24e is formed on the rear end surface of the locking step portion 22a. Locked. Thus, the guide shaft 24 is attached so as to be rotatable relative to the rear shaft 22 and not to be removed.
[0020]
On the inner peripheral surface of the rear shaft 22, a cam protrusion (cam portion) 22 b sharpened forward in a V shape is projected in the inner diameter direction. A small recess 22c is formed at the tip of the cam projection 22b. On the other hand, small cam protrusions 16a, 18a, and 19a are provided on the outer peripheral surfaces of the sliders 16, 18, and 19 in the outer diameter direction. The cam protrusions 16a, 18a, and 19a are V-shaped on the cam protrusion 22b. It can move along the boundary surface, and can engage with the recess 22c in the recess 22c.
[0021]
The mechanical pencil writing body 12 has a lead feeding mechanism 40 that feeds the lead at its tip, and the lead feeding mechanism 40 includes a fastening chuck 42 that fastens and feeds the lead as is well known. A chuck ring 44 for further tightening the tightening chuck 42 from the outer peripheral side, a chuck spring 46 for biasing the tightening chuck 42 rearward, and the like. Further, the mechanical pencil writing body 12 has a core case pipe 50 to which the clamping chuck 42 is connected directly or via a joint 48, and a spare core is accommodated in the pipe hole of the core case pipe 50. Is done. The rear end of the core case pipe 50 is inserted into the slider 16. As shown in FIG. 6, the slider 16 has a core insertion hole 16 b formed therein, and the core insertion hole 16 b communicates with the pipe hole of the core case pipe 50. The other ballpoint pens 14 and 15 have refills in which ink is stored, and the rear ends of the refills are inserted into the sliders 18 and 19.
[0022]
Inside the rear part of the rear shaft 22, a core derivative 28 that is rotatable relative to the rear shaft 22 is disposed. As shown in FIG. 3, the core derivative 28 includes a main body portion 28a disposed between the plurality of locking pieces 24b of the guide shaft 24, and a pipe-shaped core guiding portion extending forward from the main body portion 28a. A core insertion hole 28c through which one core can be inserted is formed through the main body portion 28a and the core guiding portion 28b. The main body portion 28a has three blocks 28e, 28e, 28e that can be inserted into the three slide grooves 24c of the guide shaft 24, and a gap formed between each block 28e is a main body portion 28a. Concave portion 28d is formed on the peripheral surface. Then, the locking piece 24b of the guide shaft 24 is fitted into the recess 28d. In the state where the locking piece 24b is fitted in the recess 28d, as shown in FIG. 5, the main body portion 28a and the locking piece 24b formed of the three blocks 28e are formed with the hook-like projections 24e of the locking piece 24b. A circular outer contour is formed except for a portion where the core shaft 28 passes through a hollow portion on the inner diameter side of the locking step portion 22a of the rear shaft 22, and the core derivative 28 can rotate with the guide shaft 24 relative to the rear shaft 22. It has become. Further, as shown in FIG. 5, since the core insertion hole 28c is formed in one block 28e between the recess 28d and the adjacent recess 28d, it may compete / interfer with the locking piece 24b. Arranged so that there is no.
[0023]
The core guiding portion 28b of the core derivative 28 extends in the slide groove 24c, and the tip thereof is inserted into the core insertion hole 16b of the slider 16 from the rear. Thereby, the core insertion hole 28 c of the core derivative 28 communicates with the pipe hole of the core case pipe 50 through the slider 16.
[0024]
A clip cap 30 is connected to the rear end portion of the rear shaft 22 by press fitting. Further, an eraser receiver 32 with an eraser 34 and a knock cap 36 are detachably fitted to the clip cap 30 or the rear end portion of the rear shaft 22. It is put.
[0025]
In the composite writing instrument configured as described above, when the rear shaft 22 is rotated with respect to the front shaft 20, relative rotation occurs between the rear shaft 22 and the guide shaft 24, and thus the guide groove 24 c of the guide shaft 24. The fitted sliders 16, 18, 19 rotate relative to the rear shaft 22. Then, the cam protrusions 16a, 18a, 19a of the sliders 16, 18, 19 move along the boundary surface of the cam protrusion 22b of the rear shaft 22, and either slider engages with the recess 22c at the tip of the cam protrusion 22b. If it matches, the front-end | tip of the writing body connected with the slider protrudes from the front-end | tip of the front axis | shaft 20, and is maintained in a writing position. In addition, the cam projections of the other sliders are located behind the recesses 22c of the cam projections 22b, and the writing body connected to these sliders is maintained at the retracted position behind the tip of the front shaft 20. The Further, when the rear shaft 22 is rotated with respect to the front shaft 20, the writing body maintained at the writing position can be switched, or all the writing bodies can be maintained at the retracted position. In the above operation, when the guide shaft 24 rotates, the core derivative 28 also rotates together.
[0026]
When the core of the mechanical pencil writing body 12 is replenished, the knock cap 36 and the eraser receiver 32 are removed from the clip cap 30 or the rear shaft 22 as shown in FIG. 6 or FIG. Then, the rear end surface of the core derivative 28 is exposed, and the core L can be inserted from the core insertion hole 28c. The core L inserted from the core insertion hole 28 c passes through the core insertion hole 16 b of the slider 16 and moves into the pipe hole of the core case pipe 50. In this way, replenishment of the lead can be performed from the back of the composite writing instrument as in the procedure of a single writing instrument. The core derivative 28 always rotates integrally with the guide shaft 24, so that the core guiding portion 28 b of the core derivative 28 always maintains the relationship of communicating with the core insertion hole 16 b of the slider 16 and the pipe hole of the core case pipe 50. Therefore, even if the mechanical pencil writing body 12 is in the retracted position (FIG. 6) or the writing position (FIG. 7), the lead can be replenished at any position.
[0027]
When using the core replenished to the mechanical pencil cursive body 12, if the knock cap 36 is knocked while the mechanical pencil cursive body 12 is in the writing position, the rear shaft 22 is advanced with respect to the front shaft 20. The knocking force is transmitted from the cam projection 22b to the slider 16, and the lead case pipe 50 advances. Thereby, the lead can be paid out by the operation of the lead feeding mechanism 40.
[0028]
In the present invention, the main body portion 28a of the core derivative 28 forms a circular outer contour together with the locking piece 24b of the guide shaft 24, and passes through the inner diameter side hollow portion of the locking step portion 22a. The narrow space of the locking step 22a is efficiently used. Since the core insertion hole 28c is formed in one block 28e between the adjacent recesses 28d and 28d, the core insertion hole 28c does not interfere with the locking piece 24b and efficiently uses a narrow space. Be able to.
[0029]
Further, since the locking piece 24b is fitted in the recess 28d of the main body portion 28a of the core derivative 28, the locking piece 24b cannot be displaced in the inner diameter direction. The protrusion 24e does not come off the locking step 22a of the rear shaft 22. When performing the work of assembling the guide shaft 24 to the rear shaft 22, the guide shaft 24 is inserted from the front of the rear shaft 22, and the locking piece 24b is moved in the inner diameter direction by using the elastic force of the locking piece 24b. The hook-shaped protrusion 24e is passed through the hollow portion on the inner diameter side of the locking step portion 22a of the rear shaft 22, and the hook-shaped protrusion 24e is locked to the locking step portion 22a. Thereafter, the core derivative 28 is inserted from the rear of the rear shaft 22, and the main body 28a is disposed between the plurality of locking pieces 24b. Accordingly, since the locking piece 24b cannot be displaced in the inner diameter direction by the main body 28a, the guide shaft 24 can be prevented from being detached from the rear shaft 22.
[0030]
【The invention's effect】
As described above, according to the present invention, the guide shaft can be securely attached to the rear shaft so that the guide shaft can be rotated by being locked to the locking step portion of the rear shaft. Furthermore, the core derivative efficiently uses the narrow space in which the rear shaft locking step portion is formed in order to pass through the inner shaft side hollow portion of the rear shaft locking step portion together with the guide shaft locking piece. It is possible to secure a core insertion passage by the core insertion hole formed in the core derivative. Since the core derivative can rotate with the guide shaft, no matter how the mechanical pencil cursive is in the position from the most retracted position to the most advanced position, in other words, how the mechanical pencil cursive is relative to the rear axis. Even if the rotation position is in the correct position, the lead guiding portion of the lead derivative is always in communication with the rear end opening of the lead case on the almost same line as the lead case of the mechanical pencil writing body, so that the lead can be replenished.
[Brief description of the drawings]
FIG. 1 is an overall longitudinal sectional view of a composite writing instrument according to an embodiment of the present invention.
FIG. 2 is an exploded perspective view of main parts.
3A is a side view of the core derivative, FIG. 3B is a view taken along the arrow b in FIG. 4A, and FIG. 3C is a view taken along the arrow c in FIG.
FIG. 4 is a perspective view of a combined state of a guide shaft and a core derivative.
5 is a cross-sectional view taken along line 5-5 of FIG.
FIG. 6 is a cross-sectional view of the rear part of the composite writing instrument when the lead is refilled with the mechanical pencil writing body in the retracted position.
FIG. 7 is a cross-sectional view of the rear part of the composite writing instrument when the lead is replenished with the mechanical pencil in the writing position.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Shaft cylinder 12 Mechanical pencil writing bodies 14, 15 Writing bodies 16, 18, 19 Slider 20 Front shaft 22 Rear shaft 22a Locking step portion 22b Cam projection (cam portion)
24 Guide shaft 24b Locking piece 28 Core derivative 28a Main body portion 28b Core guide portion 28c Core insertion hole 28d Recess 50 Core case pipe

Claims (6)

Contains a plurality of cursive bodies, at least one of which is a mechanical pencil cursive, and has a front shaft and a rear shaft that is rotatable relative to the front shaft and has a cam portion inside. In the composite writing instrument that can selectively protrude from the tip of the front shaft by selectively rotating the tip of any of the plurality of writing bodies by the cam portion by rotating relative to the cam.
A guide shaft that is coupled to the front shaft so as to be integrally rotatable and guides the writing body in the front-rear direction extends in the rear shaft, and an inner surface of the rear shaft protrudes in an inner diameter direction. A stop step portion is formed, and a plurality of locking pieces are formed at the rear end portion of the guide shaft and pass through the inner diameter side hollow portion of the locking step portion and locked to the locking step portion. A core derivative that is rotatable relative to the rear shaft is disposed between the plurality of locking pieces, and the core derivative extends further forward to the rear end opening of the core case of the mechanical pencil cursive body. and has a core inductive portion communicating, the plurality of engaging pieces on the peripheral surface are formed a plurality of recesses for fitting, the inner diameter side hollow locking stepped portion of the annular formed before Symbol rear axle A composite writing instrument characterized by passing through a section. The composite writing instrument according to claim 1, wherein a slider cooperating with the cam portion is provided at a rear end of the writing body, and the slider is guided in the front-rear direction by the guide shaft. The core derivative has a main body portion disposed between the plurality of locking pieces and formed with the recess, and a core insertion hole extends between the main body portion and the core guiding portion. The composite writing instrument according to claim 1, wherein the composite writing instrument is formed as described above. The composite writing instrument according to claim 3, wherein the core insertion hole is formed between two adjacent concave portions of the main body portion. The composite writing instrument according to any one of claims 1 to 4, wherein the locking piece of the guide shaft is prevented from being displaced in the inner diameter direction by the core derivative. 6. The composite writing instrument according to claim 1, wherein the core derivative forms an outer contour with a circular cross section together with a locking piece of the guide shaft.

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